Word filtered from U.S. Department of Agriculture sources is that a genetically modified sorghum developed for use in cellulosic ethanol might be classified as a noxious weed, which would restrict its planting.
Ceres Inc., a biotech research and development company, developed the sorghum, which has been shown to grow a large mass of vegetation. Apparently because the company used genetic material from a noxious weed along with various sorghum plants, the USDA is looking at the new sorghum as a potential noxious weed, too.
Read full, original article: Is biotech sorghum a noxious weed?